Typewriting machine



April 14, 1931' A. cs. F KUROWSKI TYPEWRITING MACHINE Filed Dec. 18,1926 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE ALFRED G. F.KUROW SKI, OF BROOKLYN, NEW YORK, ASSIGN'OR T UNDERWOOD ELLIOTT FISHERCOMPANY, OF NEVT YORK, N. Y., A CORPORATION OF DELAWARE TYPEWRITINGMACHINE Application filed December 18, 1926. Serial No. 155,609.

This invention relates to typewriting machines of that class where aplaten-lever is operable'to sweep the platen forwardly or rearwardlygreater distances than the usual line- 7 spacing mechanism.

This novel device is adapted for application to standard typewriters,and includes an adjustable platen-sweep handle on the platenframe andoperatively connected to the platen by means of a pawl which isresiliently held in engagement with a ratchet-wheel. This pawl may belocked in permanent engagement by means of a dog, so that theplaten-sweep handle will rock the ratchet-wheel and the platentlperewith, during the return movement there- 0 7 It is practicable foran operator to first insert a card or a sheet into the machine, at therear of the platen, and then operate the handle to sweep the platen andwork-sheet to the printing line, then type a line of printing, andfinally return the handle to the starting point, thereby rolling theplaten rearwardly with the typed work-piece, which is carried back outof the machine.

When the handle is restored to its normal position. the locking dog andpawl are released from said ratchet-wheel, and the platen may be rotatedfreely by the usual platen-knob, or line spaced by the usual linespacemechanism, making it possible to operate the t ewriter for ordinar worksuch yp y the pawl in its released position and illusas letter writing.

One of the features of this invention is that the locking dog is notonly effective to positively lock the pawl in tooth-interlockingposition to swing the ratchet-wheel therewith during the return movementof the handle, but is also effective to positively prevent overthrow ofthe platen when the handle is operated forwardly against a stop.

It will be understood that this device can be used for performing twokinds of special work-sheet feeding work in addition to the regularline-spacing of the worksheet. Moreover, the same equipment can beapplied to different machines and perform one kind of work in onemachine and another kind in another machine, thus making it unnecessaryto carry a stock of two kinds of platen-controlling attachments.

In order that the device may be used for typing a connected series offorms of uniform lengths, the locking dog is provided with a handlewhereby it may be automatically released at the end of the forwardstroke of the sweep-handle, so that throughout said return strokethereof the platen will remain stationary, the pawl riding freely backover Figure 3 is a conventional cross-sectional view showing some of themechanism displaced for the purpose of illustration.

Figure 4 is a diagrammatic view showing the driving pawl in its lockedposition, so as to carry the platen in forward and return movements ofthe handle.

Figure 5 1s a d1agrammat1c view showing trates how the handle may bemoved back without moving the platen therewith.

This device may be employed for handling cards or singlework-sheets tobe inserted at the rear of a platen 10, rotatably mounted in end frames11 of a platen-frame. A handle 12 is moved forwardly to thereby sweepthe '2 work-sheet to the printing line. The handle is pivotally mountedupon a stud 13 fast to a supporting side plate 14: and carries a pawl 15designed to engage a ratchet-wheel 16 loosely mounted to rotate aboutthe stud 13. The

pawl is mounted upon a screw 17 fast to the handle, and is held inengagement with the teeth of the ratchet-wheel by means of a spring 18which serves also as a means for operating a locking dog 19 mounted uponthe .718 fast were plate 14.

9 "desired. 1 v

handleby mea ns of a pivot-screw 20,. The ratchet-wheel 16isoperative todrive aspurgear 21 and a pinion-22 fast to the 'free end of" a'platen-axle 23;

19 are-held ininefl'ective positionsby means of stop-pins 24 and 25carried by a stop-plate 26 which is pivotally mounted upon the stud 13andmay .b'e adj ustalolyv positioned and held y in place by meanso-falockingpawl'27, which nori'nalllyengagestheteeth of afi'Xed toothed;

plate 28'and is itself carried by the stoppl'ate v 26ibymeans of a stud29. The normal or ineffective position of, the handleis shown in FigureQ. "When the handle '12 is pulled for-' wardly'to rotate the platem thepawl is released from the stop 25, andithe "fspr'ingi8. becomeseffectiveto throw the pawl'into en- 1 'gagement withthe ratchet-wheel; as shown-=in-;Figure 4:,4 The handle is-then i'moved. all

the way forwardly until it; is arrested by ;a stop or rod 30.? Thisdetermines the position 7 of the 1 card at the printing line, and, 7after typing, the-handle may be moved backwardly to its normal position,thereby ejecting the card. It is the variableirelation between thestationary stop-pin" 30 andlthe adjustable carrier-plate 26' anditsIpinS that definitely determines the handle throwand-platen-rotation, Thenumberofline-spaces that'the platen is rotatedduring' va' complet e mo'vement' of the handle i'sindicated'by a gradu--:ated scale 31 whichlco-o'perates with aninj j dex 32se'cured on thestop-plate26. The scale j: On the other hand,'in order that this deivice may'be'used for the handling or contin-' H nous "forms whichrequirethe feeding of? the V platen forwardly a ,predetermined'uniformnumber of line-spaces, the locking dog 19 is provided with a handle '33which 7 serves as a means for disengaging"the dog. from the:iawlto'thereby permit 'a sliding return-mov inent of. the pawl over theratchet teeth durin the return movement of the handle. This.

condition'is illustrated in Figure 5, i'nwhich 1' it will-be:oticedthatthe locking dog'is'held against '-a-pin:3't by means of thethumb while or the handle'iscontrolledby the otherfingersi jof thehandfj'lhe handle is held its-inef fectivei position by means 'of-a s'pring351611 circlinga spring-drum "36 carried a I handle-hub or 'sjleevejs'r.one end ofthe spring is secured' to the drum bylmeans' of a -pin i38 lThe other'end of the spring is .an-v

choredon a pirr 39 jcarried by the plate'll.

' Thehandleg l2 is5-offcourse,'operativeinde pendently byits I grip orfinger piece 49, with out engaging ifinger piecejfifi except When Thisadvice'i's preferably made theiforin I of an att'achment to astaudardtypewri.ter {11o thi'sflendfand'to the end-that the device mayi be'lca'rried in stoek'as a unit, all the- Inechanism ispermanentlytassembled and released position? varlatlons may adjustedbetween the plate 14 and the toothed plate 28 which iplates are heldtogether by means of a tie-rod 40 and the stopwith an extension 41 whichservesa's a bearingfor a short shaft 42; The latter carries side of theplate28 so that when a screw 46 [which securesthe pinion 22 to theplatenvaxle is loosened the pinion and the finger; iwheel Inay betakenofithe platen-shaft of the machine together with the othermechanism; '-It will 1 be particularly notedfthat I 7 rod 30. Thetoothedplate 28is provided v jNorinally the pawl 15' and the lockingdog thereis also-disclosed-a factory assembled' and; factory adjusted, selfcontained, plfatendriving mechanism attachable ias an 'assem bled unitto'any Underwoodtypewriting machine; that the ,footi47 of one side plate14L may be attached to the carriage by two displaceable screws 48entering factory threa'dr ed holes inthe carriage-end'll, andthehub U ofthepinion 22 engaging the. short =p'roje'cting end of the platen-shaft23 by' thefsc'rew 46 becomes a coupling effective to axially connect theoriginal platen-shaft 231 with the auxiliary shaft li and lengthen theoriginal Q platen-shaft, so that the platen may be driven by thepinion22 or rotated by the fingerwheel 43; that the lengthening of theplaten- ,shaft 23' the means providedin the at- 'taohment, removes thenecessity for replae' ing the original platen-shaft by-a'neirv. andlonger one piecef shaftfandwhich displacement is] especiallyobjectionable where the platen 'i s providedwith a factory 7 assembledfrictionalflline-spacing mechanism; and that; 1

V the operating handle '12jcarriesiaTone-way "platen-driving pawl 7 15and further a eas a manually-operated pawl-controlling trip 19'effective" to] render the one-way driving fserting and a paper-ejectingoperationio'r'to rotate the platen forwardly :foria p-aper-in pawleffective to rotate the platen" forwardly v sertingoper'ation only,and-permit theipawlr 15 to drag idly" over, the; platen-drivingtoothediwheel 16', back to aq-norinal-iplatenbe resorted to' within thel s'copeof the. invention, and portions of the I claim: w-i

1'. a platen-sweeping mecllanism for 'feedinga work-sheet into a'typewriting ma improvements maybe used without others; 1

i Having thus described. my invention, f

chine, theicombination with a pinion on the an operating lever; and'japawl on said Javelndrnially "disengaged; from said ,ratchet- Vplaten-shaft a gear in,traintofdriveg said ,pln on, a ratchetrwheel, todrive saidge'aig' ratchet-wheel and rotate said platen-shaft, ofpawl-locking means" mounted upon said operating lever and renderedeffective by the release of said pawl to lock said pawl in engagementwith the ratchet-wheel, and a spring connecting said pawl with itslocking means and effective to throw the pawl into engagement with theratchet-wheel and throw the locking means into interlock with the pawl,said locking means also having a pawl-releasing device manually operableat the end of the forward sheet-feeding movement of the platen toforcibly release the locked pawl and allow the operating lever to bereturned to normal position, and independently of the platen.

2. In a platen-sweep mechanism attachable as a preassembled unit ofmechanism to one carriage-end and to the projecting end of aplaten-shaft without disassembly of the unit, said unit including a pairof spacedapart side plates, one plate secured to the carriage-end withreplaceable screws, the other plate forming a bearing for anextension-shaft maintained in said hearing between a couplingconnectible to the platenshaft end and a finger-wheel, said couplingformed with a pinion to be driven by a train of connected mechanisms,including a piniondriving multiplying gear, a toothed wheel for drivingsaid gear, an operating handle, a oneway pawl on said handlespring-pressed in the direction of the toothed-wheel, a backstoprockably mounted upon the axis of the handle and operative to disablethe pawl at normal position against its spring, mechanism operable toset the back-stop to predetermine the extent of platen-rotation to afixed stop on the frame, a drum fixed to rotate with the handle, aspring having one end fixed to the drum and the other end fixed to theframe and assembled under a tension operative to restore the operatinghandle to its normal pawl disabling position when re leased by thehandle after a forward platen sweeping operation, and means pivotallymounted upon the operating handle and spring-pressed into co-operationwith the one-way pawl to render the pawl effective as a locked-uptwo-way pawl to drive the toothed-wheel forward and back to rotate theplaten in two directions, said means being engageable with the sameback-stop and jointly disabled with the pawl at the normal position ofthe operating handle.

3. In a platen-sweep mechanismattachable as a preassembled unit ofmechanism to one carriage-end and to the projecting end of aplaten-shaft without disassembly of the unit, said unit including a pairof spaced-apart side plates, one plate secured to the carriage-end withreplaceable screws, the other plate forming a bearing for anextension-shaft maintained in said baring between a coupling connectibleto the platen-shaft end and a finger-wheel, said coupling formed with apinion to be driven by a train of connected mechanisms, including apinion-driving multiplying gear, a toothed-wheel for driving said gear,an operating handle, a one-way pawl on said handle spring-pressed in thedirection of the toothed-wheel, a back-stop rockably mounted upon theaxis of the handle and operative to disable the pawl at normal positionagainst its spring, mechanism operable to set the back-stop topredetermine the extent of platen-rotation to a fixed stop on the frame,a drum fixed to rotate with the handle, a spring having one end fixed tothe drum and the other end fixed to the frame and assembled under atension operative to restore the operating handle to its normalpawl-disabling position when released by the hand after a forwardplaten-sweeping operation, and means pivotally mounted upon theoperating handle and spring-pressed into co-operation with the one-waypawl to render the pawl effective as a locked-up two-way pawl to drivethetoothed-wheel forward and back to rotate the platen in twodirections, said means being engageable with the same back-stop andoint- 1y disabled with the pawl at the normal position of the operatinghandle, said means also including a disabling arm operative to releasethe locked-up pawl at the end of the forward stroke of the handle toprovide an idling sweep of the pawl to its back-stop position. ALFRED G.F. KUROWSKI.

